Patent GB-190706068-A (GB)
Title: Improvements in or relating to Machines for Levelling the Soles of Boots or Shoes
Filed: 1907-03-13
Granted: 1908-03-12
Abstract: 6068. Jerram, A. E., and British United Shoe Machinery Co. March 13. Soles.-A machine for levelling the soles of boots by direct pressure, similar to that described in Specification No. 21,588, A.D. 1903, comprises a bed-plate A supporting bearings for shafts about which a frame C for supporting the moulds, and levers D for supporting the jacks, oscillate. A shaft F is rotated from a countershaft G, which is put into connexion with the driven pulley G<1> by means of a clutch G' actuated by a pedal H. The clutch is similar to that described in Specification No. 720, A.D. 1907, [Abridgment Class Fastenings, Dress]. The shaft F is provided with a crank which is connected by means of a link I to a frame J, pivoted at J' and connected to the frame C by a connecting-rod J<a>. The rod J<2> is not directly attached to the frame C, but is yieldingly connected by a device which permits the mould to be applied with a pressure which is light at first and finally heavy, and which also compensates for differences in the thickness of the soles acted on. The rod J<2> is pivoted to a lever K connected at one end to a bolt L and at the other end to a sleeve M. The bolt L is connected to the carrier C by a strong spring N. Within the sleeve M is a screwed rod P, the head P' of which is adapted to form a braking- surface P<2> against the side of a recess in the frame C. At the other end of the rod P is an adjustable screw P', against which one arm of a bell-crank lever Q is adapted to engage. A cam R on the shaft F engages with one arm of a bell-crank lever R', the end of the other arm of this lever having a cam-surface R<2>, which engages with a roller Q<1>on the bell crank lever Q. A spring R<3> tends to bring the recessed portion of the surface R<2> in line with the roller Q'. Each of the levers D is moved by a connecting-rod D<2> pivotably connected to it at D<3>. This connecting-rod is provided with a roller D' adapted to be guided by a camgroove T formed on the side of a spur-wheel T<1>, which is mounted on a shaft J<1> and driven by a spur-wheel mounted on the shaft F. The clutch G' is controlled by a lever H<1> operated by the pedal H. An arm H', attached to the lever H, carries at its end a roller H<3> which bears against a cam H<4> on the shaft F. This cam is of such a shape that, after one complete revolution of the shaft F, the lever H<1> is permitted to move so as to throw the clutch out of action. The mould carrier is pivoted to the frame C, and is provided with a cylindrical surface V<1> resting in a corresponding surface in the flame C. In action, the machine is started by depressing the pedal H, which throws the clutch G' into action and causes the frame C to be brought into a position in which the mould makes contact with the sole of the boot. At this time, the bell-crank lever Q presses on the screw P<3>, thus keeping the surface.P' of the screw P out of contact with the surface in the frame C. The sleeve M is consequently withdrawn from the frame and causes rotation of the screw P. Lost motion is thus provided, and the mould is depressed with yielding pressure. As the machine continues to operate, the bell-crank lever Q is brought out of engagement with the screw P<3>, thereby allowing the surface P<2> to come into contact with the surface in the frame C. The rota. tion of the screw P and, in consequence, the further withdrawal of the sleeve M is thus prevented. The tension in the rod J<2> is then transmitted without any yielding to the frame C, and the final heavy pressure is obtained.